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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd764219be5e569b0fe1855f85e80c5bf7ea00eca1aea5aafb8c659d382910c9e' 
  AND token = 'wnrxHhAxq8van6W39KE1T0AWQeLwm56IYtOFshVA1Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}